CN2854584Y - Biological sensor based on negative refraction photon crystal open cavity - Google Patents
Biological sensor based on negative refraction photon crystal open cavity Download PDFInfo
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- CN2854584Y CN2854584Y CN 200520013602 CN200520013602U CN2854584Y CN 2854584 Y CN2854584 Y CN 2854584Y CN 200520013602 CN200520013602 CN 200520013602 CN 200520013602 U CN200520013602 U CN 200520013602U CN 2854584 Y CN2854584 Y CN 2854584Y
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- negative refraction
- open cavity
- photonic crystals
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Abstract
The utility model discloses a biosensor based on negative refraction photonic crystals open cavity, which comprises a negative refraction photonic crystals with the evenly divided scale of three 60 degree vertex angles as wedge angle and three regular triangle air grooves covering in the medium materials board in the medium base plate. The photonic crystals' structure is of negative refraction, so that it comprises a zero optical path closed path with a regular triangle air groove. Meanwhile, there is a quite high transmission rate in the interface between the photonic crystals and air, so that the open cavity is able to generate resonance in a certain wave length, and has fairly high quality factor. If some materials to be measured are put in the air grove, the transmission rate change of the materials will bring the excursion of the resonance wave length, and then the transmission rate change of the materials can be got through measuring the wave length. The utility model employs the totally open resonance cavity structure, and the material to be measured is filled in the three air grooves, thus ensuring the fluidity of the samples, and easy to realize the real-time measurements. Furthermore, this structure has a quite small volume and the required amount of the material to be measured is quite small.
Description
Technical field
The utility model relates to the biosensor technology field, particularly relates to a kind of biology sensor based on negative refraction photon crystal open cavity.
Background technology
Biology sensor is the new and high technology that is interpenetrated and grown up by multiple subjects such as biology, chemistry, physics, medical science, electronic technology, be a kind of with the biological response element selectivity and one can produce the analytical equipment that combines with the proportional signal transmitter of testing concentration.The characteristics that selectivity is good, highly sensitive, analysis speed is fast, cost is low because it has, can carry out the on-line continuous monitoring in complex system, biology, medical science, environmental monitoring, food, medicine, and field such as military medicine demonstrate wide application prospect, caused the very big concern of countries in the world.
In numerous biology sensors, because the Photobiology sensor has nondestructive operator scheme, higher signal produces and reading speed, add development of fiber technology and application in recent years, the detection mode and the application of Photobiology sensor are all expanded greatly, become remarkable focus.
The detection mechanism of traditional biology sensor and even Photobiology sensor is mainly still analyzed the transmitted light that sees through analyzing samples, detects by Strength Changes or spectral analysis to transmitted light.Shortcomings such as traditional Photobiology sensor is big to biological specimen (for example blood) demand, generally also needs sample is carried out pre-service, generally need add other reagent of people when measuring simultaneously, and bring biochemical reaction slow excessively thus, and parallel processing capability is weak.
Photon crystal structure is to have been proposed in 1987 respectively by Yablonovich and John, and people further investigate photonic crystal afterwards.People such as Notomi in 2000 propose photonic crystal source region in cloth the center have a negative effective refractive index, opened up the another direction of photonic crystal research.The open cavity structure is that Notomi at first put forward in 2000, its basic thought utilizes positive and negative refraction rate medium to make light path offset exactly, but this open cavity structure that Notomi proposes realizes that by a rectangular configuration very high reflection is arranged, thereby this open cavity can not be worked.
Summary of the invention
The purpose of this utility model provides a kind of biology sensor based on negative refraction photon crystal open cavity.
The technical scheme that its technical matters that solves the utility model adopts is:
Overlaying on the dielectric material plate on the medium substrate plate five equilibrium, to be carved with three drift angles be that 60 ° of angle of wedge negative refraction photonic crystals and three equilateral triangle air grooves are formed.
Described drift angle is that 60 ° of angle of wedge negative refraction photonic crystals are the rounded projections arranged form crystalline network with negative refraction characteristic.
Described rounded projections arranged form lattice with negative refraction characteristic is the air borehole structure.
The beneficial effect that the utlity model has is:
1. the photon crystal structure of this 60 ° of angles of wedge can guarantee that photonic crystal and air interface reflections are very little, thereby based on the open cavity of this structure good performance is arranged;
2. utilize resonant wavelength to change the sensor of realization along with variations in refractive index, sensitivity is very high, can measure the faint variation of refractive index;
3. response is fast, and the consumption of sample is quite little, can realize Wicresoft's measurement;
4. the air groove relative volume of Cai Yonging is bigger, is suitable for flowing of sample, helps real-time measurement;
5. adopt the manufacture method of lithographic printing, again can be on a chip integrated a plurality of identity units and reach the purpose of surveying a plurality of analytes simultaneously.So just improve the parallel processing capability of device greatly, thereby promoted biochemistry detection speed again;
6. sensor, is convenient to popularize far below large-scale analytical instrument together with the cost of analyzer.
Description of drawings
Fig. 1 is the structural representation of the biology sensor of the utility model photonic crystal open cavity;
Fig. 2 is the Y section schematic cross-section of the biology sensor of the utility model photonic crystal open cavity;
Fig. 3 is the second equifrequent distribution curve that can be with of negative refraction photon crystal structure of the present utility model;
Fig. 4 is the spectral response synoptic diagram of photonic crystal open cavity of the present utility model;
Fig. 5 is that the resonant wavelength of photonic crystal open cavity biology sensor of the present utility model and quality factor are with the variations in refractive index synoptic diagram.
Embodiment
As shown in Figure 1 and Figure 2, overlaying on the dielectric material plate 1 on the medium substrate plate 4 five equilibrium, to be carved with three drift angles be that 60 ° of angle of wedge negative refraction photonic crystals 2 and three equilateral triangle air grooves 3 are formed.
Described drift angle is that 60 ° of angle of wedge negative refraction photonic crystals 2 are for having the rounded projections arranged form crystalline network of negative refraction characteristic.
Described rounded projections arranged form lattice with negative refraction characteristic is air circular hole 5 structures.
Described photonic crystal dielectric material can be gallium arsenide, indium phosphide, aluminium oxide, silicon etc.
At first to determine the structure of the photonic crystal of open cavity, make this structure have the negative refraction characteristic.Choose triangle airport photon crystal structure, calculate and to find, when the radius r of airport is taken as 0.4a (a is a lattice period), as can be seen from Figure 3, can have significant negative refraction characteristic second by being with.For E polarization (electric field is parallel to z direction among Fig. 2), the equifrequent curve of Fig. 3 approaches a circle, show that at 0.3 (c/a) photon crystal structure can be regarded as an isotropic medium in 0.315 (c/a) this frequency range, total has equivalent refractive index.When frequency was 0.30 (c/a), equivalent refractive index Neff approached-1.
There are some researches show, when incident angle along with the photonic crystal plane parallel the time with air groove interphase direction, boundary reflection is very big, and when incident angle along with the photonic crystal plane vertical the time with air groove interphase direction, boundary reflection is then very little.Therefore, can design as shown in Figure 1 by three 60 ° of wedge shape negative refraction photon crystal structures and three open cavity structures that 60 ° of air wedges are formed.The design of this 60 ° of wedge structures is to guarantee that all interphases are all vertical with incident direction, so just can guarantee that six interfacial reflections of photonic crystal and air groove are all very little, thereby can guarantee that main energy all concentrates in the air wedge.From the angle of light path, be exactly that light takes a round in the chamber, whole light path is 0, the positive and negative refraction branch of commanding troops offsets, thereby can produce resonance in certain frequency.Adopt another advantage of air wedge to be that compare with traditional resonant cavity, the volume of this air groove is relatively large, can be suitable for flowing of sample, help real-time measurement.
For the specificity analysis of negative refraction photon crystal open cavity, can adopt Finite Difference-Time Domain branch (FDTD) method.The interphase of air wedge and photonic crystal wedge is by three among Fig. 1 leg-of-mutton drift angle coordinate D1, D2, D3 decision.As simple embodiment, consider D1, D2, D3 symmetrical structure, three triangular apex all are d to the distance of true origin.Can determine that by utilizing the FDTD method when the d=0.49, the negative refraction photon crystal open cavity structure has the highest quality factor q.When Fig. 4 has provided d=0.49, the spectral response of negative refraction photon crystal open cavity structure, resonant frequency is 0.309657 (c/a) as can be seen, quality factor is Q=1254.After knowing resonant frequency, the mode profile of total correspondence just can be by obtaining with FDTD under this resonant frequency.
Fig. 5 has provided the figure as a result that measures the biological sample variations in refractive index based on the biology sensor of negative refraction photon crystal open cavity.The faint variation of refractive index will cause the remarkable drift of resonant wavelength as we can see from the figure.Just can determine corresponding refractive index by measuring resonant wavelength.
Claims (3)
1, a kind of biology sensor based on negative refraction photon crystal open cavity is characterized in that: overlay on dielectric material plate (1) on the medium substrate plate (4) and go up five equilibrium to be carved with three drift angles be 60 ° of angle of wedge negative refraction photonic crystals (2) and three equilateral triangle air grooves (3) composition.
2, a kind of biology sensor based on negative refraction photon crystal open cavity according to claim 1 is characterized in that: described drift angle is that 60 ° of angle of wedge negative refraction photonic crystals (2) are for having the rounded projections arranged form crystalline network of negative refraction characteristic.
3, a kind of biology sensor based on negative refraction photon crystal open cavity according to claim 2 is characterized in that: described rounded projections arranged form lattice with negative refraction characteristic is air circular hole (a 5) structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520013602 CN2854584Y (en) | 2005-07-28 | 2005-07-28 | Biological sensor based on negative refraction photon crystal open cavity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520013602 CN2854584Y (en) | 2005-07-28 | 2005-07-28 | Biological sensor based on negative refraction photon crystal open cavity |
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| CN2854584Y true CN2854584Y (en) | 2007-01-03 |
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| CN 200520013602 Expired - Fee Related CN2854584Y (en) | 2005-07-28 | 2005-07-28 | Biological sensor based on negative refraction photon crystal open cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813629A (en) * | 2010-04-29 | 2010-08-25 | 大连海事大学 | Photonic crystal fiber chemical/biological sensing head and preparation method thereof |
-
2005
- 2005-07-28 CN CN 200520013602 patent/CN2854584Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813629A (en) * | 2010-04-29 | 2010-08-25 | 大连海事大学 | Photonic crystal fiber chemical/biological sensing head and preparation method thereof |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070103 Termination date: 20100728 |